We study the generation of supercontinua in air–silica microstructured fibers by both nanosecond and femtosecond pulse excitation. In experiments, a 300-nm broadband visible continuum was generated 1.8-m length fiber pumped at 532 nm 0.8-ns pulses from frequency-doubled passively Q-switched Nd:YAG microchip laser. At this wavelength, dominant mode excited under conditions is LP11 mode, and, with pumping, self-phase modulation negligible dominated interplay Raman parametric effects. The...

The fabrication and characterization of an all-solid photonic bandgap fiber is reported. presents a low-loss region (< 20 dB/km) around 1550 nm can be used as single-mode even for core diameter large microm. zero dispersion at the short wavelength edge bandgap. measured polarisation mode dependent but remains small (few ps/km1/2). This opens possibility to realize area with doped or Bragg gratings.

We provide a complete experimental characterization of stimulated Brillouin scattering in 160 m long solid-core photonic crystal fiber, including threshold and spectrum measurements as well positionresolved mapping the frequency shift.In particular, three-fold increase power is observed, excellent agreement with spectrally-broadened gain spectrum.Distributed additionally reveal that rise results from broadband nature all along fiber strongly influenced by strain.Our experiments confirm these...

A 300 nm broadband visible continuum has been generated in a 1.8 m length of microstructured fibre pumped at 532 by 0.8 ns pulses from frequency-doubled passively Q-switched Nd:YAG microchip laser. With nanosecond pulses, self-phase-modulation is negligible, and the generation dominated interplay Raman parametric effects.

We propose a new solution for modal decomposition in multimode fibers, based on spectral and spatial imaging technique. The appearance of spurious modes the processing images at output fiber under test when it has more than two is demonstrated theoretically. method, which allows us to identify modes, accurate, simpler, faster previously reported methods. For demonstration, measurements standard step-index small-core microstructured are carried out successfully.

A highly birefringent polarization-maintaining chalcogenide microstructured optical fiber (MOF) covering the 3-8.5 µm wavelength range has been realized for first time. The cross-section consists of 3 rings circular air holes with 2 larger adjacent to core. Birefringence properties are calculated by using vector finite-element method and compared experimental ones. group birefringence is 1.5x10-3 losses equal 0.8 dB/m at 7.55 µm.

We report on the development of a 20 µm-core polarization maintaining endlessly single-mode photonic crystal fiber for use in delivery high-power single-frequency lasers, especially quantum physics experiments. A complete numerical study is used to determine optimal geometry be single mode over 600-1700nm spectral range with extinction ratio greater than dB. Three versions this different pitch and hole size ratios were fabricated experimentally characterized at 780 nm, 1064 1550 nm. The...

We report the experimental generation, simply by use of a subnanosecond microchip laser at 532 nm and conventional dispersion-shifted fiber, supercontinuum that spans more than 1100 nm. show detailed spectral analysis this originates from preliminary four-wave mixing process with multimode phase matching subsequent double-cascade stimulated Raman scattering is transversely single mode as result Raman-induced competition. This technique believed to be simplest configuration allows one...

We propose a novel type of photonic crystal fiber (PCF), including an elliptical hole in its solid core. prove the feasibility such and investigate both experimentally theoretically dependence group birefringence on geometric parameters. show, for first time, that form-induced can be achieved single mode PCFs with large area suggest it as possible route development polarization maintaining PCF-based LMA devices.

Optimal suppression of higher-order modes (HOMs) in hollow-core antiresonant fibers comprising a single ring thin-walled capillaries was previously studied, and can be achieved when the condition on capillary-to-core diameter ratio is satisfied (d/D≈0.68). Here we report conditions for maximizing leakage losses HOMs nested node-less fibers, while preserving low confinement loss fundamental mode. Using an analytical model based coupled capillary waveguides, as well full-vector finite element...

The birefringence of an air–silica microstructure fiber has been studied by measurement the polarization mode dispersion (PMD) over wavelength range 545–640 nm. experimental results are shown to be in good agreement with vectorial numerical calculations, assuming elliptical core eccentricity 7%. We also report controlled experiments studying nonlinear modulation instability fiber, yielding 3.9-THz modulational sideband shifts that theoretical predictions based on calculated and PMD characteristics.

We compare, thanks to a Sagnac interferometer, the phase sensitivity strain of different microstructured optical silica fibers (MSF) that we design and fabricate. Our results show when same elongation is applied MSF, induced change equal or lower than one obtained for standard fiber, showing no advantage on this parameter sensing applications.

Summary form only given. In optical WDM communication systems, the 35 nm gain bandwidth available with conventional EDFAs sets a limit to increase of transmission rates. It is important develop new amplifiers in several spectral ranges between 1.3 /spl mu/m and 1.6 mu/m, broad bandwidths flat profiles, another restrictive factor long-haul systems involving repeated steps amplification. Multi-pumped fiber Raman dual-band doped-host are some presently developed devices. We study approach based...

We report on the design, fabrication and characterization of an elliptical hollow photonic crystal fiber (EH-PCF), a PCF with hole in its solid core, for applications requiring large mode area high birefringence

We present the important fabrication issues involved with realization of low loss, water peak, nonlinear holey fibers based on Stack and Draw technique. have realized loss performances in 1.38 μm spectral region that are limited by intrinsic losses raw materials, opening up possibility using long lengths such to demonstrate phenomenon as Raman amplification supercontinuum generation continuous wave pump sources.

Photonic-bandgap fibers (PBGF) are suitable for Raman-free propagation due to their intrinsic spectral filtering properties. The use of an all-solid PBGF Raman has been demonstrated. In this paper, we focus on the design PBGFs propagation, and evaluate performance by using efficient spectrally-resolved model which recently developed.

We investigate the performances and noise characteristics of recent concept fiber optical parametric chirped-pulse oscillator (FOPCPO). Our FOPCPO is based on an in-house built functionalized nonlinear for power handling delivers broadly tunable pulses in 820 nm (signal) 1380 (idler) bands. Pulses can be dechirped to sub-500~fs duration with energy up 500 nJ. This system also exhibits excellent RIN we highlight that cavity's feedback level a key parameter strong impact FOPCPO's dynamics....

We investigate the performances and noise characteristics of recent concept fiber optical parametric chirped-pulse oscillator (FOPCPO). Our FOPCPO is based on an in-house built functionalized nonlinear for power handling delivers broadly tunable pulses in 820 nm (signal) 1380 (idler) bands. Pulses can be dechirped to sub-500~fs duration with energy up 500 nJ. This system also exhibits excellent RIN we highlight that cavity's feedback level a key parameter strong impact FOPCPO's dynamics....

We investigate the performances and noise characteristics of recent concept fiber optical parametric chirped-pulse oscillator (FOPCPO). Our FOPCPO is based on an in-house built functionalized nonlinear for power handling delivers broadly tunable pulses in 820 nm (signal) 1380 (idler) bands. Pulses can be dechirped to sub-500 fs duration with energy up 500 nJ. This system also exhibits excellent RIN we highlight that cavity’s feedback level a key parameter has strong impact FOPCPO’s dynamics....

Abstract The research field of fiber optical parametric amplifiers has steadily expanded over the last two decades as a host all-optical signal processing techniques have been demonstrated in nonlinear fibers such wavelength conversion, regeneration, switching, limiting, buffering, and sampling. This article reviews system performances theses devices gain bandwidth, focuses on main limitations demonstrates efficient for suppressing them.